21042222030 has 96 divisors (see below), whose sum is σ = 57831321600. Its totient is φ = 5293584576.

The previous prime is 21042222017. The next prime is 21042222031. The reversal of 21042222030 is 3022224012.

21042222030 is a `hidden beast` number, since 21 + 0 + 422 + 220 + 3 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21042221994 and 21042222012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21042222031) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 382947 + ... + 434433.

It is an arithmetic number, because the mean of its divisors is an integer number (602409600).

Almost surely, 2^21042222030 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21042222030, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28915660800).

21042222030 is an abundant number, since it is smaller than the sum of its proper divisors (36789099570).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21042222030 is a wasteful number, since it uses less digits than its factorization.

21042222030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51758 (or 51755 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

Adding to 21042222030 its reverse (3022224012), we get a palindrome (24064446042).

The spelling of 21042222030 in words is "twenty-one billion, forty-two million, two hundred twenty-two thousand, thirty".